Paul sandoz-barbier



(No Model.)

P. SANDOZ-BARBIER.

STOP WATCH. I

No. 455,026. Patented June 80,1891.

UNITED STATES PATENT OFFICE.

PAUL SANDOZ-BARBIER, OF CHAUX-DE-FONDS, S\VITZERLAND,ASSIGNOR TOMARCHAND & SANDOZ, OF SAME PLACE.

STOP-WATCH.

SPECIFICATION forming part of Letters. Patent No. 455,026, dated June30, 1891. Application filed February 26, 1891. Serial No. 382,939. (Nomodel.) Patented in $witzerland August 14, 1890, No. 2,440.

To all whom it may concern:

Be it known that I, PAUL SANDOZ-BARBIER, watch-manufacturer, ofOhaux-de-Fonds, in Switzerland, have invented certain new and usefulImprovements in Stopatches, more particularly applicable in combinationwith repeating-watch es, (for which I have obtained a patent inSwitzerland, No. 2,440, dated August 14, 1890,) of which the followingis a specification.

The invention relates to stop-watches having a seconds-hand and aminute-hand.

This improvement may be combined with different mechanism ofstop-watches with or without soundingmechanism; but in the accompanyingdrawings said improvements are shown as they are applied to a soundingwatch, said mechanism being for that purpose placed upon the top of thewatch-movementand not between plate and dial, as usual.

The improvements relate especially to the transmission of motion fromthe seconds-hand to the minute-hand.

In the drawings, Figure 1 is a plan View of the improved mechanism. Fig.2 is a plan view of the dial. Fig. 3 shows the stop mechanism for thehands at rest at zero. Fig. 4 shows on an enlarged scale the piecesoperating the transmission of movement from the seconds-hand to the minute-hand. Fig.5 shows separately the form of lever P, and Fig. 6 showsseparately the form of lever I.

The startingand the stopping of the secondshand M is effected by anoscillating bridge 0, carrying an intermediate wheel 0 to transmit therotation of a wheel D, which is affixed upon the axis of one of thewheels of the watchmovement to a wheel E, the axis of which carries thehand m. The fulcrum of the oscillating bridge 0 is placed so as to havethe wheel 0 remaining always in gear with wheel D. The arm of the bridge0 projects toward the cam B, and when it rests upon a full part or fallsinto a notch of said cam the wheel 0 is in or out of gear with thecentral wheel E to move the seconds-hand M to allow it to stop. The camB is moved by a pusher A, acting upon one end of a double-armed lever A,which has on its other end a click or hook a, acted upon by a spring a.At each depression of the pusher A the click or hook a turns the cam Bone tooth, and when the pusher is released the spring a restores thepusher to its normal position and the hook at to be hooked to the nexttooth of the cam B. To stop the seconds hand accurately, there is abrake-lever F, having its fulcrum in f, and the one arm f of which ispressed by the spring f against the cam B. The end g of said lever fbears against the circumference of the wheel E, acting like a brake whenthe arm f rests upon an elevated portion of the cam B, and it is thrownout of contact with said wheel E when the arm f falls into a notch ofthe cam B.

The axis of wheel E is provided with a cam II, against which rests oneend of a lever I, having its fulcrum in 'i. A spring J maintains thesame in the said position. The lover I carries a hook K, acted upon by asmall spring in, so as to gear with the teeth of the wheel L. The lattermay at will directly carry the hand that indicates the minutes, or, asin the mechanism shownin the drawings, transmit its motion to the saidhand m by suitable intermediate wheels placed beneath the dial. (Notshown.) hen the stop-movement is in ac tion, the cam II, turning withthe wheel E, lifts the lever I once at each of its revolutions. Thiscauses the hook K to turn the wheel L one tooth at each revolution ofthe wheel E, when thelever I falls from the top of the cam II upon thelowest part of the latter. Zis a retaining-spring preventing the jumpingof the wheel L more than one tooth ata time. To set the hands M and m tozero, there are provided two levers or hammers P and Q, having a commonfulcrum O and a similar arm R,bearing against the cam B under the actionof the springs p and q. \Vhen the arm R falls into a notch of the cam B,the hammers I and Q are caused to strike upon the heart-piece 25 and a,which bear the hands M and m, respectively. The heart-piece it beingaffixed to the wheel L, it is necessary to disengage the hook K fromsaid wheel I, when the hand m is to be set to zero. To effect this thelever I has an arm V, the part c of which bears against a pin 2 of thehook K. The arm V causes the hook K to be disengaged, as seen in Fig. 8,somewhat before the lever P is striking toward the heart-piece a.

The action of the whole mechanism is as follows: The mechanism beingconnected with the train, Fig. 1, if the pusher A is depressed the cam Bwill act simultaneously upon the bridge 0 to disengage wheel a fromwheel E and upon the lever F to cause the same to act as a brake uponthe wheel E. If the pusher is depressed again, the cam B will maintainthe bridge 0 in its previous position, but lift the brake-lever F out ofcontact with E, and the cam will simultaneously cause the lever Q tostrike upon the heart-piece t and the lever P to strike upon theheart-piece u, and

the lever P disen gages the hook K from wheel L. At a third depressionof the pusher A the cam B causes the bridge 0 to replace the wheel 0into gear with Wheel E. The lever F remains in its previous liftedposition and the lever P with its arm V and lever Q are lifted out ofreach of the heart-pieces 'L6 and t. Thereby the hook K falls again intogear with wheel L, and the cam H causes the said hook K to turn thewheel L, as above specified, once at each revolution of the wheel E.

Having thus described my invention, I claim- In a stop-watch, thecombination, with the Wheel L, heart-cam, and hand m, of the cam B, alever P, having an arm R, bearing against earn B under the action of aspring 1), the lever 1, and hook K, and an arm V for lifting the hook Kout of reach of the teeth of the wheel L before the lever P strikes uponthe heart-cam, substantially as shown and described, and for the purposespecified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

PAUL SANDOZ-BARBIER. [L. s]

Witnesses:

ADOLPHE BROSSARD, ETIE MONNIERE.

